Merge pull request #7860 from eder-matheus/ppl_remove_random

ppl: remove random pin placement functionality

Author: maliberty

src/ppl/README.md

@@ -255,15 +255,11 @@ place_pin
 
 The `place_pins` command places all pins together. Use the following command to perform pin placement:
 
-Developer arguments:
-- `-random`, `-random_seed`
 
 ```tcl
 place_pins 
     -hor_layers h_layers
     -ver_layers v_layers
-    [-random_seed seed]
-    [-random]
     [-corner_avoidance length]
     [-min_distance distance]
     [-min_distance_in_tracks]
@@ -294,13 +290,6 @@ value, or a range of values. For example, in `place_pins -hor_layers metal2
 three intervals are excluded: the whole top edge, the right edge from 15
 microns to 60.5 microns, and the left edge from its beginning to 50 microns.
 
-#### Developer Arguments
-
-| Switch Name | Description |
-| ----- | ----- |
-| `-random_seed` | Specify the seed for random operations. |
-| `-random` | When this flag is enabled, the pin placement is random. |
-
 ### Write Pin Placement
 
 The `write_pin_placement` command writes a file with the pin placement in the format of multiple calls for the `place_pin` command:

src/ppl/include/ppl/IOPlacer.h

@@ -88,8 +88,8 @@ class IOPlacer
   void init(odb::dbDatabase* db, Logger* logger);
   void clear();
   void clearConstraints();
-  void runHungarianMatching(bool random_mode);
-  void runAnnealing(bool random);
+  void runHungarianMatching();
+  void runAnnealing();
   Parameters* getParameters() { return parms_.get(); }
   int64 computeIONetsHPWL();
   void excludeInterval(Edge edge, int begin, int end);
@@ -134,14 +134,8 @@ class IOPlacer
                           const std::set<int>& ver_layer_idx);
   std::vector<int> getValidSlots(int first, int last, bool top_layer);
   std::vector<int> findValidSlots(const Constraint& constraint, bool top_layer);
-  void randomPlacement();
-  void randomPlacement(const std::vector<int>& pin_indices,
-                       const std::vector<int>& slot_indices,
-                       Edge edge,
-                       bool top_layer,
-                       bool is_group);
   std::string getSlotsLocation(Edge edge, bool top_layer);
-  int placeFallbackPins(bool random);
+  int placeFallbackPins();
   void assignMirroredPins(IOPin& io_pin, std::vector<IOPin>& assignment);
   int getSlotIdxByPosition(const odb::Point& position,
                            int layer,